//
//  UIColorExted.m
//  CYGJ
//
//  Created by Chen Qian on 2019/12/5.
//  Copyright © 2019 Facebook. All rights reserved.
//

#import "UIColorExted.h"

@implementation UIColorExted

+ (UIColor*) colorWithHex:(NSInteger)hexValue alpha:(CGFloat)alphaValue
{
    return [UIColor colorWithRed:((float)((hexValue & 0xFF0000) >> 16))/255.0
                           green:((float)((hexValue & 0xFF00) >> 8))/255.0
                            blue:((float)(hexValue & 0xFF))/255.0 alpha:alphaValue];
}

+ (UIColor*) colorWithHex:(NSInteger)hexValue
{
    return [self colorWithHex:hexValue alpha:1.0];
}

+ (NSString *) hexFromUIColor: (UIColor*) color {
    if (CGColorGetNumberOfComponents(color.CGColor) < 4) {
        const CGFloat *components = CGColorGetComponents(color.CGColor);
        color = [UIColor colorWithRed:components[0]
                                green:components[0]
                                 blue:components[0]
                                alpha:components[1]];
    }

    if (CGColorSpaceGetModel(CGColorGetColorSpace(color.CGColor)) != kCGColorSpaceModelRGB) {
        return [NSString stringWithFormat:@"#FFFFFF"];
    }

    return [NSString stringWithFormat:@"#%x%x%x", (int)((CGColorGetComponents(color.CGColor))[0]*255.0),
            (int)((CGColorGetComponents(color.CGColor))[1]*255.0),
            (int)((CGColorGetComponents(color.CGColor))[2]*255.0)];
}


+ (CGFloat) colorComponentFrom: (NSString *) string start: (NSUInteger) start length: (NSUInteger) length

{

    NSString *substring = [string substringWithRange: NSMakeRange(start, length)];

    NSString *fullHex = length == 2 ? substring : [NSString stringWithFormat: @"%@%@", substring, substring];

    unsigned hexComponent;

    [[NSScanner scannerWithString: fullHex] scanHexInt: &hexComponent];

    return hexComponent / 255.0;

}



+ (UIColor *) colorWithHexString: (NSString *) hexString

{

    NSString *colorString = [[hexString stringByReplacingOccurrencesOfString: @"#"withString: @""] uppercaseString];

    CGFloat alpha, red, blue, green;

    switch ([colorString length]) {

        case 3: // #RGB

            alpha = 1.0f;

            red   = [self colorComponentFrom: colorString start: 0 length: 1];

            green = [self colorComponentFrom: colorString start: 1 length: 1];

            blue  = [self colorComponentFrom: colorString start: 2 length: 1];

            break;

        case 4: // #ARGB

            alpha = [self colorComponentFrom: colorString start: 0 length: 1];

            red   = [self colorComponentFrom: colorString start: 1 length: 1];

            green = [self colorComponentFrom: colorString start: 2 length: 1];

            blue  = [self colorComponentFrom: colorString start: 3 length: 1];

            break;

        case 6: // #RRGGBB

            alpha = 1.0f;

            red   = [self colorComponentFrom: colorString start: 0 length: 2];

            green = [self colorComponentFrom: colorString start: 2 length: 2];

            blue  = [self colorComponentFrom: colorString start: 4 length: 2];

            break;

        case8: // #AARRGGBB

            alpha = [self colorComponentFrom: colorString start: 0 length: 2];

            red   = [self colorComponentFrom: colorString start: 2 length: 2];

            green = [self colorComponentFrom: colorString start: 4 length: 2];

            blue  = [self colorComponentFrom: colorString start: 6 length: 2];

            break;

        default:

            [NSException raise:@"Invalid color value" format: @"Color value %@ is invalid.  It should be a hex value of the form #RBG, #ARGB, #RRGGBB, or #AARRGGBB", hexString];

            break;

    }

    return [UIColor colorWithRed: red green: green blue: blue alpha: alpha];

}

+ (NSString *)hexString:(UIColor*) color {
  const CGFloat *components = CGColorGetComponents(color.CGColor);

  CGFloat r = components[0];
  CGFloat g = components[1];
  CGFloat b = components[2];

  return [NSString stringWithFormat:@"#%02lX%02lX%02lX",
          lroundf(r * 255),
          lroundf(g * 255),
          lroundf(b * 255)];
}

@end
